US6785250B2 - Method and apparatus for time-sharing channelization code in a CDMA communication system - Google Patents

Method and apparatus for time-sharing channelization code in a CDMA communication system Download PDF

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US6785250B2
US6785250B2 US09/901,921 US90192101A US6785250B2 US 6785250 B2 US6785250 B2 US 6785250B2 US 90192101 A US90192101 A US 90192101A US 6785250 B2 US6785250 B2 US 6785250B2
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compressed
terminals
terminal
frame
frames
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US20030026235A1 (en
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Alkinoos H. Vayanos
Francesco Grilli
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Qualcomm Inc
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Qualcomm Inc
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Priority to KR1020047000242A priority patent/KR100920407B1/ko
Priority to CNB028175409A priority patent/CN1247044C/zh
Priority to JP2003513278A priority patent/JP4278512B2/ja
Priority to PCT/US2002/021782 priority patent/WO2003007647A1/en
Priority to EP02752245A priority patent/EP1405542A1/de
Priority to BR0210945-0A priority patent/BR0210945A/pt
Priority to TW091115166A priority patent/TW580805B/zh
Publication of US20030026235A1 publication Critical patent/US20030026235A1/en
Priority to US10/929,120 priority patent/US7599336B2/en
Publication of US6785250B2 publication Critical patent/US6785250B2/en
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/24—Radio transmission systems, i.e. using radiation field for communication between two or more posts
    • H04B7/26—Radio transmission systems, i.e. using radiation field for communication between two or more posts at least one of which is mobile
    • H04B7/2618—Radio transmission systems, i.e. using radiation field for communication between two or more posts at least one of which is mobile using hybrid code-time division multiple access [CDMA-TDMA]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J13/00—Code division multiplex systems
    • H04J13/0007—Code type
    • H04J13/004—Orthogonal
    • H04J13/0044—OVSF [orthogonal variable spreading factor]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J13/00—Code division multiplex systems
    • H04J13/16—Code allocation
    • H04J13/18—Allocation of orthogonal codes
    • H04J13/20—Allocation of orthogonal codes having an orthogonal variable spreading factor [OVSF]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/04—Wireless resource allocation
    • H04W72/044—Wireless resource allocation based on the type of the allocated resource
    • H04W72/0466—Wireless resource allocation based on the type of the allocated resource the resource being a scrambling code
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/12—Wireless traffic scheduling
    • H04W72/1263—Mapping of traffic onto schedule, e.g. scheduled allocation or multiplexing of flows
    • H04W72/1273—Mapping of traffic onto schedule, e.g. scheduled allocation or multiplexing of flows of downlink data flows
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B2201/00—Indexing scheme relating to details of transmission systems not covered by a single group of H04B3/00 - H04B13/00
    • H04B2201/69—Orthogonal indexing scheme relating to spread spectrum techniques in general
    • H04B2201/707—Orthogonal indexing scheme relating to spread spectrum techniques in general relating to direct sequence modulation
    • H04B2201/70703—Orthogonal indexing scheme relating to spread spectrum techniques in general relating to direct sequence modulation using multiple or variable rates
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H04B7/0613—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
    • H04B7/0615—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal
    • H04B7/0619—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal using feedback from receiving side
    • H04B7/0621—Feedback content
    • H04B7/0634—Antenna weights or vector/matrix coefficients
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H04B7/0613—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
    • H04B7/0667—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of delayed versions of same signal
    • H04B7/0669—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of delayed versions of same signal using different channel coding between antennas

Definitions

  • the present invention relates generally to data communication, and more specifically to techniques for time-sharing a common channelization code among a number of terminals in compressed mode to more efficiently utilize the available channelization codes.
  • Wireless communication systems are widely deployed to provide various types of communication including voice and packet data services. These systems may be based on code division multiple access (CDMA), time division multiple access (TDMA), or some other multiple access technique. CDMA systems may provide certain advantages over other types of system, including increased system capacity.
  • CDMA system is typically designed to conform to one or more standards, such as IS-95, cdma2000, and W-CDMA standards, all of which are known in the art and incorporated herein by reference.
  • the W-CDMA standard supports a “compressed mode” of operation on the downlink whereby data is transmitted from a base station to a terminal within a shortened time duration (i.e., compressed in time).
  • the compressed mode is used in W-CDMA to allow a terminal in active communication with the system (i.e., on a traffic channel) to temporarily leave the system in order to perform measurements on a different frequency and/or a different Radio Access Technology (RAT) without losing data from the system.
  • RAT Radio Access Technology
  • data is transmitted to the terminal during only a portion of a (10 msec) frame so that the remaining portion of the frame (referred to as a transmission gap) may be used by the terminal to perform the measurements.
  • the reduction in the transmission time for a given compressed frame can be achieved by either (1) reducing the amount of data to transmit to the terminal in the frame, (2) increasing the coding rate, or (3) increasing the data rate.
  • Each of these available mechanisms for transmitting a compressed frame is associated with tradeoffs that may impact performance, as described below.
  • reducing the amount of data to transmit in a compressed frame may be achieved via scheduling at a higher signaling layer, but the reduced amount of data may be undesirable for some applications.
  • the reduction in the amount of data may cause a corresponding reduction in the rate of an adaptive multi-rate (AMR) vocoder down to a level (e.g., 5.15 kbps) that may result in significantly reduced quality of service.
  • AMR adaptive multi-rate
  • increasing the coding rate may be achieved by “puncturing” or deleting some of the coded bits (this mechanism is only available on the downlink).
  • this mechanism is only available on the downlink.
  • the transmission gap increases (to up to 7 slots out of 15 possible slots in a frame)
  • more coded bits need to be punctured
  • the coding rate increases, and higher transmit power is needed for the unpunctured bits to achieve the desired level of performance (i.e., a particular bit error rate or frame error rate) at the terminal.
  • the desired level of performance i.e., a particular bit error rate or frame error rate
  • To perform inter-frequency/inter-RAT measurements long transmission gaps (e.g., almost half a frame) will likely be required.
  • puncturing is impractical for these longer transmission gaps because of the excessively high transmit power requirement.
  • the W-CDMA standard utilizes orthogonal variable spreading factor (OVSF) codes of various lengths to channelize the data prior to transmission to the terminals.
  • the length or spreading factor (SF) of the OVSF codes can range from 4 to 512 chips, with shorter-length codes being capable of supporting correspondingly higher data rates.
  • a compressed frame for a particular terminal may be channelized with a channelization code of half the length (i.e., SF/2) as that of the channelization code used for non-compressed frames for the terminal.
  • SF/2 half the length
  • the W-CDMA standard defines a specific relationship between the channelization code of length SF used for non-compressed frames and the channelization code of length SF/2 used for compressed frames.
  • the use of the specifically defined channelization code of length SF/2 for compressed frames reduces the number of channelization codes available for other uses by the system. In general, fewer codes are available for use as the spreading factor decreases, e.g., half as many channelization codes are available if the spreading factor is reduced by a factor of two.
  • a channelization code of length SF/2 is assigned to each terminal operating in compressed mode and for the duration in which the terminal is in this mode. Each terminal in compressed mode would then effectively take up two channelization codes of length SF since one channelization code of length SF/2 occupies the “code space” of two channelization codes of length SF. Since W-CDMA may be code-limited on the downlink, assignment of a channelization code of length SF/2 to each terminal for the transmission of compressed frames is undesirable.
  • aspects of the invention provide techniques to time-share a common channelization code among multiple terminals for compressed mode transmissions.
  • the compressed data transmissions for a given terminal make up only a small fraction of the total time the terminal is in compressed mode, in which case allocation of a shorter-length channelization code to the terminal for the entire duration of the compressed mode operation would result in inefficient utilization of the channelization code.
  • Techniques are thus provided herein to time-share a common channelization code for the compressed mode transmissions for multiple terminals.
  • a specific channelization code with a particular spreading factor is reserved by a base station and used for compressed mode transmissions for multiple terminals in communication with the base station.
  • This common channelization code may be communicated to the terminals operating in compressed mode, along with values for a set of parameters that define the timing of their compressed mode transmissions. Thereafter, whenever the base station transmits data in a compressed frame to a given terminal, the common channelization code is used instead of the channelization code assigned to the terminal for normal mode.
  • a specific embodiment of the invention provides a method for transmitting data to a number of terminals in a wireless (e.g., W-CDMA) communication system.
  • each terminal is initially assigned a respective channelization code used to channelize data transmitted in non-compressed frames for the terminal.
  • a particular common channelization code used to channelize data transmitted in compressed frames for the terminals is also selected.
  • Each compressed frame includes one or more compressed transmissions and all or a portion of a transmission gap, and the data for each compressed frame is transmitted in the compressed transmission(s).
  • the compressed frames for the terminals are then scheduled such that the compressed transmissions for the compressed frames do not overlap. Thereafter, non-compressed frames for each terminal are channelized with the channelization code assigned to the terminal, and compressed frames for the terminals are channelized with the common channelization code.
  • the compressed frames may be scheduled such that (1) they are non-overlapping at their frame boundaries, (2) the compressed frames overlap but the compressed transmissions do not, and/or (3) the compressed frames are interlaced.
  • the common channelization code typically has a length that is half of the length of the shortest channelization code assigned to the terminals. For each terminal in compressed mode, the scheduling and the corresponding transmission gap pattern sequence parameters are typically determined once, and the parameter values are provided to the terminal where they are used to derive the timing and configuration of the compressed mode transmission.
  • the invention further provides other methods and apparatus that implement various aspects, embodiments, and features of the invention, as described in further detail below.
  • FIG. 1 is a diagram of a wireless communication system that supports a number of users and is capable of implementing various aspects and embodiments of the invention
  • FIG. 2 is a simplified block diagram of an embodiment of a base station and a terminal
  • FIG. 3 is a block diagram of a modulator within the base station
  • FIG. 4 is a diagram illustrating the structure of the OVSF codes defined by the W-CDMA standard and used as the channelization codes
  • FIG. 5 is a diagram of a frame format and a slot format for a downlink dedicated physical channel (DPCH) defined by the W-CDMA standard;
  • DPCH downlink dedicated physical channel
  • FIG. 6 is a diagram illustrating a compressed mode transmission in accordance with the W-CDMA standard
  • FIGS. 7A through 7E are diagrams illustrating various schemes for time-sharing a common channelization code among a number of terminals, in accordance with various embodiments of the invention.
  • FIG. 8 is a flow diagram of a process to support compressed mode using time-sharing of the common channelization code.
  • FIG. 1 is a diagram of a wireless communication system 100 that supports a number of users and is capable of implementing various aspects and embodiments of the invention.
  • System 100 includes a number of base stations 104 that provide coverage for a number of geographic regions 102 .
  • the base station is also commonly referred to as a base transceiver system (BTS), and the base station and/or its coverage area are often referred to as a cell.
  • BTS base transceiver system
  • System 100 may be designed to implement any combination of one or more CDMA standards such as IS-95, cdma2000, W-CDMA, and other standards.
  • each terminal 106 may communicate with one or more base stations 104 on the downlink and uplink at any given moment, depending on whether or not the terminal is active and whether or not it is in soft handover.
  • the downlink i.e., forward link
  • the uplink i.e., reverse link
  • base station 104 a transmits to terminal 106 a on the downlink
  • base station 104 b transmits to terminals 106 b , 106 c , and 106 i
  • base station 104 c transmits to terminals 106 d , 106 e , and 106 f , and so on.
  • a solid line with an arrow indicates a user-specific data transmission from the base station to the terminal.
  • a broken line with an arrow indicates that the terminal is receiving pilot and other signaling, but no user-specific data transmission, from the base station.
  • the uplink communication is not shown in FIG. 1 for simplicity.
  • FIG. 2 is a simplified block diagram of an embodiment of base station 104 and terminal 106 , which are capable of implementing various aspects and embodiments of the invention.
  • a transmit (TX) data processor 214 receives different types of traffic (e.g., user-specific data from a data source 212 and messages from a controller 230 ). TX data processor 214 then formats and codes the data and messages based on one or more coding schemes to provide coded data. Each coding scheme may include any combination of cyclic redundancy check (CRC), convolutional, Turbo, block, and other coding, or no coding at all. Typically, different types of traffic are coded using different coding schemes.
  • CRC cyclic redundancy check
  • the coded data is then provided to a modulator (MOD) 216 and further processed to generate modulated data.
  • the processing by modulator 216 includes (1) covering the coded data with channelization codes to channelize the user-specific data and messages onto their respective (dedicated and control) physical channels and (2) scrambling the channelized data with scrambling codes, which is equivalent to spreading of the channelized data with short pseudo-noise (PN) sequences in IS-95.
  • PN pseudo-noise
  • the modulated data is then provided to a transmitter unit (TMTR) 218 and conditioned (e.g., converted to one or more analog signals, amplified, filtered, and quadrature modulated) to generate a downlink modulated signal suitable for transmission via an antenna 220 over a wireless link to the terminals.
  • TMTR transmitter unit
  • the downlink modulated signal is received by an antenna 250 and provided to a receiver unit (RCVR) 252 .
  • Receiver unit 252 conditions (e.g., filters, amplifies, downconverts, and digitizes) the received signal and provides samples.
  • a demodulator (DEMOD) 254 then receives and processes the samples to provide recovered symbols.
  • the processing by demodulator 254 includes (1) descrambling the samples with the same scrambling code used for the physical channel being recovered (i.e., which is equivalent to despreading the samples with the short PN sequences), (2) decovering the descrambled samples to channelize the received data and messages onto their respective dedicated and common channels, and (3) coherently demodulating the channelized data with a pilot recovered from the received signal.
  • Demodulator 254 may implement a rake receiver that can process multiple instances of the received signal and combine symbols from various multipaths for the physical channel being recovered to provide the recovered symbols.
  • a transmitted signal may be received via multiple signal paths, and each received signal instance (or multipath) of sufficient strength may be assigned to and processed by a respective finger processor of the rake receiver.
  • Each finger processor processes (e.g., despreads, decovers, and pilot demodulates) the assigned multipath to provide demodulated symbols for that multipath.
  • the demodulated symbols from all assigned finger processors for a particular physical channel are then combined to provide the recovered symbols for that channel.
  • a receive (RX) data processor 256 then receives and decodes the recovered symbols to recover the user-specific data and messages transmitted on the downlink.
  • the recovered messages may be provided to a controller 260 and used to control the processing of a subsequent data transmission.
  • the processing by demodulator 254 and RX data processor 256 is complementary to that performed by modulator 216 and TX data processor 214 at base station 104 , respectively.
  • FIG. 3 is a block diagram of a modulator 216 a , which is an embodiment of modulator 216 in FIG. 2 .
  • the coded data for a particular physical channel i.e., the coded channel data
  • DEMUX I/Q demultiplexer
  • the I and Q data components are then provided to multipliers 314 a and 314 b , respectively, and covered (i.e., multiplied) with a channelization code, C ch,SF,m , assigned to the physical channel used to transmit the data.
  • the covered Q data component from multiplier 314 b is provided to a multiplier 316 and multiplied with the complex symbol, j, to generate the imaginary part of the channelized data.
  • the real part from multiplier 314 a and the imaginary part from multiplier 316 are combined by an adder 318 to provide complex channelized data.
  • the channelized data is then scrambled with a complex scrambling code, S n , by a multiplier 320 and further scaled with a weight, G, by a multiplier 322 .
  • the weight, G is selected for the physical channel being processed and is used to adjust the transmit power of the physical channel.
  • data for multiple terminals may be transmitted concurrently.
  • the scrambled and weighted data from multiplier 322 , the scrambled and weighted data for other physical channels (which may be intended for other terminals), and other data for some other physical channels (e.g., a common control physical channel) are then combined by an adder 324 to generate composite data.
  • the composite data for each antenna used for data transmission is further multiplied with a complex weight, W, by a multiplier 326 to provided the modulated data.
  • the weight, W is used for phase adjustment in closed loop mode 1 and for phase/amplitude adjustment in closed loop mode 2, which are modes of a space time block coding transmit antenna diversity (STTD) mode defined by the W-CDMA standard.
  • STTD space time block coding transmit antenna diversity
  • data to be transmitted on the downlink is channelized so that the data on multiple physical channels (e.g., intended for multiple terminals) can be transmitted and received without interfering with each other.
  • Each physical channel is assigned a particular channelization code selected from a set of possible channelization codes.
  • the codes in the set are typically designed to be orthogonal with each other so that a particular code multiplied with itself and integrated over the length of the code will result in a high (energy) value, but if multiplied with other codes in the set and integrated over the code length will result in a zero value.
  • Non-orthogonal channelization codes may also be used for channelizing but are not specified by the CDMA standards.
  • the coded data to be transmitted is covered (or multiplied) with a channelization code assigned to the physical channel used to transmit the data.
  • the transmitted data is recovered by decovering (or multiplying) the received samples with the same channelization code and integrating over the length of the code. Only data bits that have been channelized at the transmitter with the same code used for decovering at the receiver will result in high values, and data bits from other physical channels that had been channelized with other codes will integrate to low values (e.g., close to zero).
  • FIG. 4 is a diagram illustrating the structure of the orthogonal variable spreading factor (OVSF) codes defined by the W-CDMA standard and used as the channelization codes.
  • OVSF orthogonal variable spreading factor
  • the OVSF codes are “structured” codes, and successively longer OVSF codes can be generated from shorter OVSF codes in accordance with a set of rules.
  • each immediately shorter-length OVSF code is used to generate two new OVSF codes of the longer length.
  • the OVSF codes have spreading factors (or code lengths) that are factors of two.
  • W-CDMA supports the use of OVSF codes having lengths that range from 4 to 512 chips.
  • FIG. 5 is a diagram of a frame format and a slot format for a downlink dedicated physical channel (DPCH) defined by the W-CDMA standard, which can be used to transmit user-specific data to a terminal.
  • the data to be transmitted on the DPCH is partitioned into radio frames, with each radio frame including 15 slots labeled as slot 0 through slot 14.
  • Each slot is further partitioned into a number of fields used to carry traffic data, signaling, and pilot data, or a combination thereof.
  • each slot includes first and second data fields (Data1 and Data2) 520 a and 520 b , a transmit power control (TPC) field 522 , a transport format combination indicator (TFCI) field 524 , and a pilot field 526 .
  • Data fields 520 a and 520 b are used to send user-specific data.
  • Transmit power control field 522 is used to send power control information to direct the terminal to adjust its uplink transmit power either up or down to achieve the desired performance while minimizing interference to other terminals.
  • Transport format combination indicator field 524 is used to send information indicative of the format (e.g., the bit rate, channelization code, and so on) of a shared physical channel associated with the DPCH.
  • pilot field 526 is used to send pilot data for the DPCH.
  • the W-CDMA standard supports a compressed mode whereby user-specific data is transmitted to a terminal for a shortened period of time.
  • the system i.e., the UMTS Radio Access Network (UTRAN) in W-CDMA terminology
  • the terminal i.e., the User Equipment (UE) in W-CDMA terminology
  • RATs radio access technologies
  • Such other RATs may include time-division duplex (TDD/UMTS), Global System for Mobile Communications (GSM), and possibly other systems.
  • TDD/UMTS time-division duplex
  • GSM Global System for Mobile Communications
  • the system can command the terminal to operate in compressed mode.
  • FIG. 6 is a diagram illustrating a compressed mode transmission in accordance with the W-CDMA standard.
  • user-specific data for a terminal is transmitted in accordance with a transmission gap pattern sequence 610 , which is made up of alternating transmission gap patterns 1 and 2, respectively 612 a and 612 b .
  • Each transmission gap pattern 612 further comprises a series of one or more compressed frames followed by zero or more non-compressed frames.
  • Each compressed frame includes one or more compressed transmissions and all or a portion of a transmission gap.
  • the data for each compressed frame is transmitted in the compressed transmissions (s), and the data for each non-compressed frame is transmitted over an entire (10 msec) frame.
  • a compressed frame series for each transmission gap pattern includes compressed data transmission interrupted by one or two transmission gaps 614 .
  • the parameters for transmission gap pattern sequence 610 are as follows:
  • TGSN transmission gap starting slot number
  • TGL1 transmission gap length 1—the duration of the first transmission gap within the transmission gap pattern (1 to 14 slots).
  • the slots for the transmission gap must be distributed over two frames if TGL1>8 since at most 7 transmission gap slots can be included in a single frame.
  • TGL2 transmission gap length 2—the duration of the second transmission gap within the transmission gap pattern (1 to 14 slots). The same restriction as for TGL1 applies.
  • TGD transmission gap distance
  • TGPL1 transmission gap pattern length 1—the duration of transmission gap pattern 1 (1 to 144 frames).
  • TGPL2 transmission gap pattern length 2—the duration of transmission gap pattern 2 (1 to 144 frames).
  • the data for a compressed frame may be scrambled with either the same (ordinary) scrambling code used for the non-compressed frames or an alternative (secondary) scrambling code.
  • a channelization code with a lower spreading factor (or more specifically, half of the length of the channelization code used during normal operation) may be used for the compressed transmissions.
  • the W-CDMA standard defines a specific relationship between the channelization code used for the compressed frames and the channelization code used for non-compressed frames, which can be expressed as:
  • C ch,SF/2,m mod SF/2 the channelization code used for compressed frames if the alternative scrambling code is used.
  • the same set of ordinary and alternative scrambling codes is used for the data transmissions to all terminals.
  • the alternative scrambling code may be used to scramble data prior to transmission. If the alternative scrambling code is relied upon to achieve isolation between terminals in compressed mode and normal mode, then the channelization codes used for the terminals in compressed mode do not need to be orthogonal to the channelization codes used for other terminals that use the ordinary scrambling code.
  • the use of two scrambling codes to achieve isolation may not be a viable solution for downlink transmissions because the two scrambling codes are not orthogonal and the amount of achievable isolation is limited.
  • the transmissions to different terminals are typically transmitted at different power levels depending on the path loss to the terminals.
  • a high-power transmission scrambled by the (non-orthogonal) ordinary scrambling code may result in high cross-channel interference to a low-power transmission scrambled by the alternative scrambling code, which may degrade performance.
  • the same scrambling code but different channelization codes should be used for the compressed and non-compressed frames.
  • the channelization code used for the compressed frames is half the length of the channelization code used for the non-compressed frames.
  • the channelization code used for the compressed frames is specifically defined by the W-CDMA standard, and depends on whether the ordinary or secondary scrambling code is used for the compressed frames.
  • the channelization code with the lower spreading factor i.e., C ch,SF/2,x
  • C ch,SF/2,x the channelization code with the lower spreading factor
  • SF/2 is employed by the system and if each user is effectively assigned twice the number of channelization codes in order to use compressed mode, then 32 users per sector may be supported with orthogonal channelization codes in the worst case, which is much less than the 192 users per sector that may potentially be supported by cdma2000 for an equivalent bandwidth.
  • aspects of the invention provide techniques to time-share a common channelization code among multiple terminals for compressed mode transmissions. It is recognized that in many instances the compressed transmissions make up only a small fraction of a transmission gap pattern sequence. In these instances, allocation of a shorter-length channelization code to each terminal for the entire duration of the compressed mode operation would result in inefficient utilization of the channelization codes. Techniques are thus provided herein to time-share a common channelization code for the compressed mode transmissions for multiple terminals, which then make other channelization codes available for other uses.
  • a more realistic scenario may be the measurement interval typically used in the GSM system, whereby a measurement is performed every 200 msec.
  • a terminal operated in compressed mode would be allocated an extra channelization code but only making use of it 5.3% of the time, which is highly inefficient.
  • a specific channelization code with a particular spreading factor can be reserved by the system and used for compressed mode transmissions.
  • This common channelization code may be communicated to terminals operating in compressed mode (e.g., to perform inter-frequency/inter-RAT measurements) along with the transmission gap pattern sequence parameters. The sequences for the terminals can be carefully selected so that their compressed transmissions do not overlap.
  • the system i.e., the UTRAN
  • the common channelization code with a lower spreading factor is used instead of the normal channelization code.
  • Various schemes may be used to time-share a common channelization code among a number of terminals. These schemes may be designed to take into consideration various factors such as, for example, the type of compressed frames being transmitted (e.g., using a single-frame or a double-frame compressed mode pattern, which are described below), whether or not the frames for the terminals are time-aligned, the transmission gap lengths and other specifics of the compressed frames being transmitted, and so on. Some of the schemes are described below.
  • FIG. 7A is a diagram illustrating a first scheme for time-sharing a common channelization code among a number of terminals, in accordance with an embodiment of the invention. Only three terminals are shown in FIG. 7A for simplicity, although the scheme may be extended to cover any number of terminals, depending on the transmission gap pattern sequence parameters for the terminals.
  • the downlink transmissions to the terminals are time-aligned (i.e., the starts of the radio frames for all three terminals are aligned in time and further aligned to the base station's reference time).
  • a single-frame compressed mode pattern is used for the compressed frame transmissions, whereby the transmission gap resides completely within a single compressed frame.
  • the compressed transmission is shown as the shaded box and the transmission gap is shown located next to the shaded box and at the end of the compressed frame. However, the transmission gap may also be located at the start or the middle of the compressed frame.
  • the transmit power for the compressed transmission is shown as being higher than that for the non-compressed frames to ensure equivalent (e.g., BER or PER) performance for all received radio frames.
  • the single-frame compressed mode pattern is described in further detail in the 3GPP Document No. TS 25.212, section 4.4.2.
  • the compressed frames for the terminals are staggered such that only one compressed frame is transmitted to any terminal in any given frame.
  • the common channelization code, C ch,SF/2,x can thus be time-shared such that it is used for the compressed frame for terminal 1 in frame k, for the compressed frame for terminal 2 in frame k+1, for the compressed frame for terminal 3 in frame k+2, and so on.
  • Each terminal is also assigned a respective channelization code, C ch,SF,m , to be used for its non-compressed frames.
  • the common channelization code is selected such that it is orthogonal to the channelization codes assigned to the terminals.
  • a terminal While in soft handover, a terminal concurrently receives data transmissions (i.e., radio frames) from multiple base stations.
  • data transmissions i.e., radio frames
  • the W-CDMA standard provides a mechanism whereby the start time of the user-specific radio frames transmitted from each base station to the terminal can be adjusted.
  • this base station's timing relative to that of a reference base station is determined by the terminal and reported to the system. The system can then instruct the new base station to adjust its transmit timing for the terminal such that the radio frames transmitted from this new base station are approximately aligned in time to the radio frames transmitted from the other active base stations, as observed at the terminal.
  • Each data transmission from a base station to a terminal may thus be associated with a particular “frame offset” that may take on any value depending on various factors. Since the base stations in the W-CDMA system may be operated asynchronously, the amount of frame offset to be applied at each base station for the radio frames transmitted to the terminal is dependent on (1) the difference in the timing of that base station to the timing of the terminal's reference base station and (2) the difference in the propagation delays from the two base stations to the terminal. Correspondingly, from each base station's perspective, the transmit timing for each terminal in communication with the base station may be associated with a respective frame offset (from the base station reference timing, which is used for the base station's common channels), and this frame offset may take on any value.
  • Orthogonality may be achieved for multiple signals received at a terminal if these signals are time-aligned and orthogonal channelization codes are used.
  • the frame offsets are selected as integer multiples of the length of the channelization code.
  • FIG. 7B is a diagram illustrating a second scheme for time-sharing a common channelization code among a number of terminals by overlapping the compressed frames.
  • the downlink transmissions to the terminals may or may not be time-aligned, and the compressed transmissions for the terminals are scheduled as close in time as possible.
  • the compressed frames may thus overlap, but not the compressed transmissions.
  • the common channelization code is effectively used only during the fraction of the compressed frame where data is actually transmitted (i.e., the compressed transmission).
  • improved utilization of the common channelization code may be realized by reusing the code as soon as it is no longer needed by the immediately prior compressed frame.
  • the base station has knowledge (and may have some control over the assignment) of the frame offsets for all terminals and is further aware of the transmission gap pattern sequence parameters for each terminal operated in compressed mode. Based on the available information, the compressed frames for the terminals may be scheduled such that the compressed transmissions do not overlap while minimizing the time separation between these portions (to the extent possible).
  • the transmission gap pattern sequence parameters are determined by the system (e.g., a radio network controller (RNC) or a base station controller (BSC)) and provided to the terminals, the system can also select the proper parameter values such that the above stated goals of non-overlapping compressed transmissions and minimum time separation are achieved.
  • the transmission gap can be adjusted by selecting the proper parameter values, which then correspondingly dictates the specific slots to be used for the compressed transmission.
  • a transmitted signal may reach a terminal via a number of signal paths (i.e., multipaths). Moreover, a time difference may exist between the terminal's active base stations in soft handover due to different propagation delays to these base stations.
  • the time separation ⁇ t X,Y between the compressed transmissions for different terminals may be selected to be equal to or greater than the time difference and/or delay spread. This time separation is typically ⁇ fraction (1/10) ⁇ th of a slot or less for CDMA systems and represents a “guard time” between the compressed transmissions for different terminals. If the frame offset is zero as shown in FIG. 7A, then a guard time of zero maximizes the reuse of the common channelization code.
  • FIG. 7C is a diagram illustrating a third scheme for time-sharing a common channelization code among a number of terminals using a double-frame compressed mode pattern.
  • the downlink transmissions to the terminals are time-aligned.
  • the transmission gap spans over two consecutive compressed frames and may be placed anywhere between these two frames as long as seven or less transmission gap slots are included in each frame.
  • the double-frame compressed mode pattern may be used when the transmission gap is large (i.e., greater than eight slots wide).
  • the double-frame compressed mode pattern is described in further detail in the aforementioned 3GPP Document No. TS 25.212, section 4.4.2.
  • the compressed frames for the terminals are staggered such that a pair of compressed frames is transmitted to each terminal in sequential order and only one compressed frame is transmitted to any terminal in any given frame.
  • the common channelization code, C ch,SF/2,x can be shared such that it is used for the compressed frames for terminal 1 in frames k and k+1, for the compressed frames for terminal 2 in frames k+2 and k+3, for the compressed frames for terminal 3 in frame k+4 and k+5, and so on. Since the radio frames for the terminals are approximately time-aligned, the compressed frames for these terminals may be scheduled in any order.
  • FIG. 7D is a diagram illustrating a fourth scheme for time-sharing a common channelization code among a number of terminals associated with different frame offsets and using the double-frame compressed mode pattern.
  • the downlink transmissions to the terminals are not time-aligned and each terminal is associated with a respective frame offset that determines the start time of its radio frames.
  • the start of the radio frames for terminal 1 is aligned to the timing of the base station (i.e., T 1 ⁇ 0) (as an example, for this diagram) (as an example, for this diagram)
  • the start of the radio frames for terminal 2 is offset by T 2 from the timing of the base station
  • the start of the radio frames for terminal 3 is offset by T 3 from the timing of the base station.
  • the compressed frames for the terminals are scheduled based in part on their associated frame offsets. Initially, the terminals are ordered based on the amount of their frame offsets and placed in a list. For the example shown in FIG. 7D, the ordering in the list would be terminal 1 , terminal 2 , terminal 3 , and so on, since T 1 ⁇ T 2 ⁇ T 3 .
  • the compressed frames for the terminals are then scheduled based on the terminals' place in the ordered list.
  • the common channelization code is then assigned to each scheduled terminal for its compressed frame. For this embodiment, if N terminals are operated in compressed mode, then N compressed frames may be transmitted for the N terminals in as little as N+1 frames, and only one additional frame is used to account for the different frame offsets for the terminals.
  • FIG. 7E is a diagram illustrating a fifth scheme for time-sharing a common channelization code among a number of terminals using interlaced compressed frame transmissions.
  • the downlink transmissions to the terminals may or may not be time-aligned, and the double-frame compressed mode pattern is used for the compressed frames.
  • the transmission gap for a compressed frame of a particular terminal is sufficiently large, then it may be possible to fit the compressed transmission of a compressed frame for another terminal within this transmission gap.
  • the compressed transmission of the compressed frame for one terminal may be fitted within the transmission gap of the compressed frame for another terminal if the length of the transmission gap (TGL) is greater than or equal to the length of the compressed transmission (which is 15-TGL/2).
  • TGL transmission gap
  • This condition can be expressed as:
  • FIG. 8 is a flow diagram of a process 800 to support compressed mode transmission using time-sharing of a common channelization code, in accordance with an embodiment of the invention.
  • Process 800 may be implemented by each base station to support compressed mode for a number of terminals.
  • a common channelization code to be used for the compressed frames for all terminals under consideration is selected and reserved, at step 812 .
  • This code may be selected as the first code in the code-space for the lower spreading factor (e.g., C ch,SF/2,0 ).
  • the lower spreading factor e.g., C ch,SF/2,0 .
  • all terminals in communication with the base station are assigned respective channelization codes.
  • a list of terminals operating in compressed mode is then determined, at step 814 .
  • the compressed frames for the terminals are then scheduled based on any one of the schemes described above and further based on the requirements and capabilities of the terminal, at step 816 .
  • the frame offsets for the terminals may be selected (if not constrained, for example, by soft handover requirements) to achieve efficient reuse of the common channelization code.
  • the terminals may be ordered based on the value of their frame offsets and the scheduling of the compressed frames may take into account the order of the terminals in the list, as described above.
  • the scheduling may also be performed to overlap the compressed frames, as shown in FIG. 7B, or to interlace the compressed frames, as shown in FIG. 7 E.
  • the transmission gap pattern sequence parameters are then determined based on the schedule, at step 818 .
  • the transmission gap pattern sequence parameter values and the identity of the common channelization code to be used for the compressed frames are transmitted to the terminals, at step 820 .
  • each terminal in compressed mode is able to properly process and recover its compressed frames using the timing information in the parameter values and the identified common channelization code.
  • the base station thereafter transmits the compressed frames to the terminals at the scheduled times (or frames) and using the common channelization code, at step 822 .
  • the improvement in the utilization of the channelization codes using the time-sharing techniques described herein may be quantified by way of an example.
  • This operating scenario is one in which the use of compressed mode with SF/2 is crucial.
  • ten terminals need to perform inter-frequency/inter-RAT measurements.
  • time-sharing techniques described herein can reduce the number of required channelization codes.
  • the amount of improvement in code utilization is dependent on various factors such as the particular scheme to be used for the compressed mode. The improvement for some of the schemes is described below.
  • the radio frames for the terminals are time-aligned (i.e., frame offset is zero for all terminals), and the (double) compressed frames for a different terminal may be scheduled every two frames.
  • the ten terminals can time-share a common channelization code for the compressed mode.
  • the radio frames for the terminals are not time-aligned and the compressed frames for the ten terminals can be scheduled based on their frame offsets relative to the base station reference timing. If the compressed frames for the ten terminals are scheduled in order, starting with the terminal with the smallest frame offset and ending with the terminal with the largest frame offset, then for the parameter values described above, it is possible to schedule nine terminals to share a common channelization code. In this case, 18 compressed frames for the nine terminals may be scheduled in 20 frames and two frames are lost due to the non-aligned radio frames.
  • the improvement in code utilization described above may be achieved independently of the length of the transmission gap.
  • the downlink code-space is seen as a potentially significant limitation to the system capacity in W-CDMA. As noted above, in cells at the boundary of the system coverage or at the edge of the coverage area of a given channel frequency, it is likely that many or all terminals will be in compressed mode all or much of the time. The conventional implementation for supporting compressed mode with SF/2 further exacerbates this limitation since another channelization code is effectively used for each terminal in compressed mode. The techniques described herein can provide significant reduction in code-space usage and may be implemented with little impact on current design.
  • a common channelization code may be used in a time-shared manner to process (e.g., channelize) the radio frames for the terminals.
  • the techniques described herein may also be used for other types of codes (e.g., scrambling codes) used to process data prior to transmission.
  • the elements of terminal 106 and base station 104 may be designed to implement various aspects and embodiments of the invention, as described above.
  • the elements of the terminal or base station may be implemented with a digital signal processor (DSP), an application specific integrated circuit (ASIC), a processor, a microprocessor, a controller, a microcontroller, a field programmable gate array (FPGA), a programmable logic device, other electronic units, or any combination thereof.
  • DSP digital signal processor
  • ASIC application specific integrated circuit
  • FPGA field programmable gate array
  • Some of the functions and processing described herein may also be implemented with software executed on a processor. For example, selection of a particular channelization code to use as the common channelization code, the scheduling of the compressed frames for the terminals operating in compressed mode, and so on, may be performed by controller 230 .

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US09/901,921 US6785250B2 (en) 2001-07-09 2001-07-09 Method and apparatus for time-sharing channelization code in a CDMA communication system
EP02752245A EP1405542A1 (de) 2001-07-09 2002-07-09 Verfahren und vorrichtung zur kanalisierungskode-zeitaufteilung in einem cdma-kommunikationssystem
TW091115166A TW580805B (en) 2001-07-09 2002-07-09 Method and apparatus for time-sharing channelization code in a CDMA communication system
CNB028175409A CN1247044C (zh) 2001-07-09 2002-07-09 Cdma通信系统中时间共享信道化码的方法和设备
JP2003513278A JP4278512B2 (ja) 2001-07-09 2002-07-09 Ｃｄｍａ通信システムにおいてチャネライゼーションコードを時間共有するための方法及び装置
PCT/US2002/021782 WO2003007647A1 (en) 2001-07-09 2002-07-09 Method and apparatus for time-sharing channelization code in a cdma communication system
KR1020047000242A KR100920407B1 (ko) 2001-07-09 2002-07-09 Ｃｄｍａ 통신 시스템에서 채널화 코드를 시간 공유하기 위한 방법 및 장치
BR0210945-0A BR0210945A (pt) 2001-07-09 2002-07-09 Método e equipamento para compartilhamento de tempo de código de canalização em um sistema de comunicação cdma
US10/929,120 US7599336B2 (en) 2001-07-09 2004-08-27 Method and apparatus for time-sharing channelization code in a CDMA communication system
HK05100795A HK1068759A1 (en) 2001-07-09 2005-01-31 Method and apparatus for time-sharing channelization code in a cdma communication system

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JP2004535735A (ja) 2004-11-25
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US7599336B2 (en) 2009-10-06
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US20050025096A1 (en) 2005-02-03
CN1554206A (zh) 2004-12-08
WO2003007647A1 (en) 2003-01-23
BR0210945A (pt) 2004-08-31
TW580805B (en) 2004-03-21
KR20040017282A (ko) 2004-02-26

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